[FieldTrip] About connectivity and ft_topoplotCC

Christian Mista cmista at bioingenieria.edu.ar
Wed Dec 13 14:16:17 CET 2017

Hi all,

I'm starting with EEG analysis and Fiedltrip, and I'll would like to plot
topographical maps of the connectivity (using imaginary part of
coherence).  I tried ft_topoplotCC to make a connection line/arrow graph,
but I think I'm doing something wrong because the graph at 10 hz seems to
be the same at 50 hz (attached some images). In addition, I was wondering
if there is any way to set a threshold, so only fewer lines are plotted in
the connection map.  Below the code I'm using in matlab.

    %calculate coherence
    cfg = [];
    cfg.method = 'mtmfft';
    cfg.taper  = 'hanning';
    %connectivity analysis needs power and phase -> 'pownadcsd'
    cfg.output = 'powandcsd';
    % windows of frequency of interest foilim
    cfg.foilim = [1 60];
    freq1 = ft_freqanalysis(cfg, data);

    %calculating the imaginary part of the coherence
    cfg = [];
    cfg.method = 'coh';
    cfg.complex = 'absimag';
    conn1 = ft_connectivityanalysis(cfg, freq1);

    %The conectome

    cfg = [];
    %my layout
    cfg.layout = layout;
    cfg.foi = 10;
    ft_topoplotCC(cfg, conn1)

    cfg = [];
    cfg.layout = layout;
    cfg.foi = 50;
    ft_topoplotCC(cfg, conn1)

Best regards / Cordiales saludos

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